/* ranks */
{ rank=max; Twin1; Twin2}; /* max is bottom */
{ rank=min; A1; C1; E1; A2; C2; E2;}; /* max is bottom */
}
/* Danish male data (a representative population of eight independent multinational cohorts reported in Silventoinen et al (2003)
Reference: K. Silventoinen, S. Sammalisto, M. Perola, D. I. Boomsma, B. K. Cornes, C. Davis, L. Dunkel, M. De Lange, J. R. Harris, J. V. Hjelmborg, M. Luciano, N. G. Martin, J. Mortensen, L. Nistico, N. L. Pedersen, A. Skytthe, T. D. Spector, M. A. Stazi, G. Willemsen and J. Kaprio. (2003). Heritability of adult body height: a comparative study of twin cohorts in eight countries. Twin Research, 6, 399-408. 10.1375/136905203770326402 */